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Process and plant for the heat treatment of fine-grained mineral solids

A solid and mineral technology, applied in the field of heat treatment of fine-grained mineral solids, can solve problems such as short residence time and inability to realize material properties, and achieve the effect of increasing productivity

Inactive Publication Date: 2011-04-06
OUTOTEC OYJ
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At such temperatures, the desired material properties cannot be achieved due to the short residence time in the flash reactor

Method used

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  • Process and plant for the heat treatment of fine-grained mineral solids
  • Process and plant for the heat treatment of fine-grained mineral solids
  • Process and plant for the heat treatment of fine-grained mineral solids

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Embodiment 1 (calcination of clay)

[0052] exist figure 2 The plant schematically shown in , for the production of 1300 tons of calcined clay per day operates with natural gas with a net calorific value (NCV) of 50000 kJ / kg.

[0053] The kaolin-rich clay-based feedstock is preheated to a temperature of 500°C under 7% humidity and fed to flash reactor 5 in two consecutive preheating stages powered by Venturi Inner tube preheater 2a, 4a and cyclone separator 2b, 4b. The flash reactor operates at 650°C to 700°C with a residence time of 5 seconds. The residence time reactor 7 is configured as a fixed fluidized bed reactor and operates at 630°C to 680°C. A particle Froude number of 3 is desired, which is in the range of 2 to 4 in practice due to variations in particle size. The residence time is from 13 minutes to 22 minutes, preferably from 16 minutes to 20 minutes.

[0054] Hot air is generated in the combustion chamber 6 for regulating the process temperature requi...

Embodiment 2

[0055] Embodiment 2 (calcination of gypsum)

[0056] exist image 3 The plant for the production of 700 tons of calcined gypsum per day, shown schematically in , operates using lignite coal with a net calorific value (NCV) of 22100 kJ / kg.

[0057] Raw materials are preheated to a temperature of 320°C and precalcined in two successive preheating stages separated by Venturi tube preheaters 2a, 4a and cyclones at 8% humidity 2b, 4b; additional heat is supplied to the Venturi 4a by supplying hot gas at 1050°C to the Venturi 4a, wherein 0.5t / h of lignite and 7500Nm are used in the combustion chamber 15 3 / h of air produces this hot air. The preheated and precalcined solids are fed to the flash reactor 5 . The flash reactor operates at 700°C to 750°C with a residence time of 10 seconds. The residence time reactor 7 was configured as a fixed fluidized bed reactor and operated at 700°C. A particle Froude number of 3 is desired, which is in the range of 2 to 4 in practice due to v...

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PUM

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Abstract

In the heat treatment of fine-grained mineral solids, in particular for calcining clay or gypsum, the solids are passed through a flash reactor (5), in which they are contacted with hot gases at a temperature of 450 to 1500 DEG C, and subsequently they are passed through a residence time reactor (7) at a temperature of 550 to 800 DEG C, from which they are withdrawn after a residence time of 1 to 600 minutes and possibly supplied to a further treatment stage.

Description

technical field [0001] The present invention relates to a method for the thermal treatment of fine-grained mineral solids, in particular for calcining clay or clay-like substances or gypsum, and to a device for carrying out this method. Background technique [0002] Traditionally, the calcination of calcined fine-grained mineral solids, such as clays, is accomplished in rotary kilns or multi-hearth furnaces. This ensures maintenance of the low temperature and residence time required for processing in the process. For example, US Patent 4,948,362 describes a method of calcining clay in which kaolin is treated with hot calcination gases in a multi-chamber calciner to enhance luster and minimize abrasion. In electrostatic precipitation, the calcined clay powder is separated from the off-gas of the calciner and treated so that the desired product is obtained. [0003] There are also known methods which allow the avoidance of movable plant equipment, such as rotary scrapers in ...

Claims

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Application Information

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IPC IPC(8): B01J6/00C04B11/00C04B33/32
CPCB01J6/004B01J6/002C04B33/32C04B11/0286B01J6/00C04B11/00
Inventor E·伽萨菲G·施奈德M·米萨拉
Owner OUTOTEC OYJ
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